i=0;
j=1;
n=images.length-1;
function prev_img() {
	if(i==0){
		i=n;
	} else {
		i--;
	}
	if(i==n){
		j=0;
	} else {
		j=i+1;
	}
	v="/photos/" + images[i][0] + ".jpg";
	l="/photos/" + images[j][0] + ".jpg";
	document.getElementById("viewing").firstChild.src=v;
	document.getElementById("loading").firstChild.src=l;
	resize();
}

function next_img() {
	if(i==n){
		i=0;
	} else {
		i++;
	}
	if(i==n){
		j=0;
	} else {
		j=i+1;
	}
	v="/photos/" + images[i][0] + ".jpg";
	l="/photos/" + images[j][0] + ".jpg";
	document.getElementById("viewing").firstChild.src=v;
	document.getElementById("loading").firstChild.src=l;
	resize();
}

function resize() {
	img_w = images[i][1];
	frame_w = img_w + 20 + "px";
	center = Math.round(390 - img_w/2);
	frame_l = center + "px";
	document.getElementById("content").style.width = frame_w;
	document.getElementById("content").style.left = frame_l;
}

function over(arrow) {
	if(arrow == "prev"){
		document.getElementById("c_l").firstChild.style.visibility = "visible";
		document.getElementById("c_r").firstChild.style.visibility = "hidden";
	} else {
		document.getElementById("c_l").firstChild.style.visibility = "hidden";
		document.getElementById("c_r").firstChild.style.visibility = "visible";
	}
}

function out(arrow) {
	document.getElementById("c_l").firstChild.style.visibility = "hidden";
	document.getElementById("c_r").firstChild.style.visibility = "hidden";
}

// arrow links handled by onclicks
function next_arrow() {
}

function prev_arrow() {
}